Tellurian.



No. 64!,967. Patented Ian. 23, I900. G. T. HUFF.

TELLURIAN.

(Application filed Aug. 30, 1899.)

(No Model.)

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UNITED STATES PATENT OFFlE GEORGE THOMAS HUFF, OF MILL GREEN, MARYLAND.

TELLURIAN.

SPECIFIGATION forming part of Letters Patent No. 641,967, dated January 23, 1900. Application filed August 30, 1899. Serial No. 729,004. (No model.)

To all whom zit may concern.-

Beit known that I, GEORGE. THOMAS HUFF, a citizen of the United States, residing at Mill Green, in the county of Harford and State of Maryland, have invented a new and useful Tellurian, of which the following is a specification.

My invention relates to improvements in tellurians; and the object in view is to provide a simple educational appliance for use in school-rooms and in other places by which pupils may be instructed to readily comprehend the orbital motion of the earth with relation to the sun, effecting the changes of seasons, as well as the rotation of the earth on its axis, involving change from day to night, and vice versa.

Afurther object is to simplify the construction with a view to minimizing the number of parts and cheapening the cost of manufacture of the device and at the same time produce a structure which cannot get out of order when subjected to continued usage and is efficient in operation.

With these ends in view the invention consists in the novel construction and arrangement of parts, which Will be hereinafter fully described and claimed.

To enable others to understand the invention, I have illustrated the same in the accompanying drawings, forming a part of this specification, and in which F1 gurel is a perspective view of a tellurian constructed in accordance with myinvention. Fig. 2 is a sectional elevation with the lower part of the stand broken away and showing the movable parts in their reversed positions.

The same numerals of reference are used to indicate like and corresponding parts in All of the operating parts of the tellurian are supported on a single cranked spindle or arbor which has its lower part secured firmly in the platforms of the stand. The cranked portion of this spindle extends a suitable dis* tance above the stand in order to carrya globular representation of the sun, said spindle and the sun-globe being firmlyor immovably supported in place on the stand. This spindle is formed in a peculiar manner to give simultaneous movement to a pair of parallel carryingarmsin opposite directions when said arms are moved in a horizontal plane with the spindle as the axis of motion, and to this end the spindle is provided or bent with double cranks 7 8. The crank 7 projects from one side of the axis of the spindle 6, while the crank 8 extends from the spindle to lie on the opposite side of the axis thereof to the first-named crank, and from this crank 8 the spindle is extended to form the vertical stem 9. By reference to Fig. 2 it will be noted that the crank 8 is disposed a short distance above the crank 7 and on the stem of the fixed spindle or arbor is firmly secured an object representative of the sun, the same being preferably in the form of a globe 1O.

11 12 designate two horizontal arms having their inner ends fitted, respectively, on the cranks 7 8 of the stationary spindle, said arms adapted to be turned in a horizontal direction around the spindle, with the cranks as their axes of motion, and as said cranks have their axes in different vertical planes reciprocating motion is imparted in opposite directions to the arms during each complete turn of the arms around the spindle. The inner ends of the arms have eyes 13 formed therein to fit snugly to the cylindrical journal portions of the cranks on the spindle; but the outer ends of the arms have short longitudinal slots 14: produced therein to accommodate a vertically-disposed shiftable spindle 15. This spindle passes through the slot in the upper arm 12 and enters the slot in the lower arm 11, and

to support the spindle against downward movement through the slots in said arms I employ a pin 16, which is secured to the lower part of the spindle in a position above the arm 11, so that the pin will rest upon the arm to support the spindle and permit it to move back and forth in the slots. A yoke 17 is secured firmly to the upper part of theoscillatory spindle 15, said yoke having an enlarged foot 17, which lies above the upper arm 12. A globe 1S, representing the planet Earth, is fitted loosely on the spindle 15 within the limits of the yoke 17, so that the globe will rest upon the foot 17 of the yoke and be free to turn on the spindle 15, by which it is supported above the arms.

In the practical construction of my device the upper arm 12 has its eye 13 drilled therein, so that the arm may be slipped over the spindle 9, and thus fitted to the crank 8 before the globe 10 is secured to the stem; but I find it necessary to bend one end of the arm 11 around the crank 7, so as to make the bent portion overlap the arm, the overlapping end being secured firmly in place by a clip 19. The globe 18 may be made of paper, composition, or any suitable material which will enable the globe to be finished in representation of the geographical division of the earths surface and with the equatorial and meridian lines.

\Vith the pair of parallel arms shifted to the left-hand side of the fixed arbor in the position shown by Fig. 1 the crank 8 projects the upper arm 12 to a position in which its outer end lies beyond the corresponding end of the lower arm, so that the shiftable spindle 15 and the globe carried thereby will be inclined upwardly to the vertical axis of the stationary arbor; but a reversal of the parallel arms to the opposite side of the stationary arbor will cause the crank 7 to project the outer end of the lower arm 11 beyond the corresponding end of the upper arm, as clearly shown by Fig. 2, in which position of the arms the spindle 15 and the globe thereon will be reversed, so as to incline inwardly toward the axis of the arbor. It is evident that when the arms assume a position intermediate between the positions indicated by Figs. 1 and 2 the cranks of the arbor will change the positions of the arms 11 12, and consequently of the spindle 15 and the globe, so that the different positions of the earth with reference to the sun in the orbital travel of the earth will be clearly delineated, and as the earth is free to be turned on the shiftable spindle the pupil may be instructed as to the cause for change of seasons and of day and night.

Slight changes may be made in the form and proportion of some of the parts Without departing from the invention.

Having thus described the invention, what I claim is- 1. A tellurian comprising a supportingstand, a single upright arbor secured firmly to said stand in a vertical position and provided with cranks which lie on opposite sides of the axis thereof, arms fitted loosely on said cranks to be sustained wholly by the arbor, a shiftable spindle supported loosely by the arms, and a globe mounted on said spindle, substantially as described.

2. A tellurian comprising a supporting stand, a single vertical arbor secured firmly to the stand and provided with the spaced cranks which lie on opposite sides of the axis of said arbor and with an extended stem, horizontal arms fitted respectively on said cranks and provided with slots near their free ends, a representation of the sun fixed to said stem of the arbor, a shiftable spindle fitted loosely in the slots of the arms andprovided with a pin adapted to rest on one arm, and a globe mounted loosely on the spindle, substantially as described.

In testimony that I claim the foregoing as my own I have hereto altixed my signature in the presence of two witnesses.

GEORGE THOMAS IIUFF.

\Vitnesses:

WM. R. WALLIS, I. K. HAMILTON. 

